loop7: detected capacity change from 0 to 40 sg_write: data in/out 917468/251 bytes for SCSI command 0x0-- guessing data in; program syz-executor.6 not setting count and/or reply_len properly ------------[ cut here ]------------ WARNING: CPU: 0 PID: 5259 at lib/iov_iter.c:629 _copy_from_iter+0x2f1/0x1130 Modules linked in: CPU: 0 PID: 5259 Comm: syz-executor.6 Not tainted 6.1.0-rc6-next-20221128 #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014 RIP: 0010:_copy_from_iter+0x2f1/0x1130 Code: 37 ff 44 89 f3 e9 2f ff ff ff e8 4a 77 37 ff be 79 02 00 00 48 c7 c7 40 b5 9e 84 e8 99 e4 5a ff e9 13 fe ff ff e8 2f 77 37 ff <0f> 0b 45 31 f6 e9 77 ff ff ff e8 20 77 37 ff 31 ff 89 ee e8 e7 72 RSP: 0018:ffff8880431475e8 EFLAGS: 00010216 RAX: 0000000000006aa7 RBX: 0000000000000000 RCX: ffffc90004a18000 RDX: 0000000000040000 RSI: ffffffff8211a1c1 RDI: 0000000000000001 RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000001000 R13: ffffea000105fa00 R14: 0000000000001000 R15: ffff888043147818 FS: 00007f221c879700(0000) GS:ffff88806ce00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2c322000 CR3: 0000000010470000 CR4: 0000000000350ef0 Call Trace: copy_page_from_iter+0xe3/0x180 blk_rq_map_user_iov+0xb0c/0x1650 blk_rq_map_user_io+0x1ee/0x220 sg_common_write.constprop.0+0xd84/0x15e0 sg_write.part.0+0x706/0xb20 loop2: detected capacity change from 0 to 40 sg_write+0x88/0xe0 vfs_write+0x358/0xe40 ksys_write+0x12b/0x260 do_syscall_64+0x3f/0x90 entry_SYSCALL_64_after_hwframe+0x72/0xdc RIP: 0033:0x7f221f303b19 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f221c879188 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f221f416f60 RCX: 00007f221f303b19 RDX: 0000000000000125 RSI: 00000000200003c0 RDI: 0000000000000005 RBP: 00007f221f35df6d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffe6cfffe3f R14: 00007f221c879300 R15: 0000000000022000 irq event stamp: 18247 hardirqs last enabled at (18291): [] asm_sysvec_apic_timer_interrupt+0x1a/0x20 hardirqs last disabled at (18338): [] sysvec_apic_timer_interrupt+0xf/0xc0 softirqs last enabled at (12604): [] __irq_exit_rcu+0x11b/0x180 softirqs last disabled at (11955): [] __irq_exit_rcu+0x11b/0x180 ---[ end trace 0000000000000000 ]--- syz-executor.7: attempt to access beyond end of device loop7: rw=2049, sector=40, nr_sectors = 4 limit=40 Buffer I/O error on dev loop7, logical block 10, lost async page write syz-executor.2: attempt to access beyond end of device loop2: rw=2049, sector=40, nr_sectors = 4 limit=40 Buffer I/O error on dev loop2, logical block 10, lost async page write loop7: detected capacity change from 0 to 40 loop2: detected capacity change from 0 to 40 sg_write: data in/out 917468/251 bytes for SCSI command 0x0-- guessing data in; program syz-executor.6 not setting count and/or reply_len properly syz-executor.7: attempt to access beyond end of device loop7: rw=2049, sector=40, nr_sectors = 4 limit=40 Buffer I/O error on dev loop7, logical block 10, lost async page write syz-executor.2: attempt to access beyond end of device loop2: rw=2049, sector=40, nr_sectors = 4 limit=40 Buffer I/O error on dev loop2, logical block 10, lost async page write loop7: detected capacity change from 0 to 40 sg_write: data in/out 917468/251 bytes for SCSI command 0x0-- guessing data in; program syz-executor.0 not setting count and/or reply_len properly syz-executor.7: attempt to access beyond end of device loop7: rw=2049, sector=40, nr_sectors = 4 limit=40 Buffer I/O error on dev loop7, logical block 10, lost async page write sg_write: data in/out 917468/251 bytes for SCSI command 0x0-- guessing data in; program syz-executor.4 not setting count and/or reply_len properly loop2: detected capacity change from 0 to 40 sg_write: data in/out 917468/251 bytes for SCSI command 0x0-- guessing data in; program syz-executor.6 not setting count and/or reply_len properly sg_write: data in/out 917468/251 bytes for SCSI command 0x0-- guessing data in; program syz-executor.0 not setting count and/or reply_len properly syz-executor.2: attempt to access beyond end of device loop2: rw=2049, sector=40, nr_sectors = 4 limit=40 Buffer I/O error on dev loop2, logical block 10, lost async page write audit: type=1400 audit(1669633474.538:10): avc: denied { write } for pid=5348 comm="syz-executor.5" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=perf_event permissive=1 Zero length message leads to an empty skb loop6: detected capacity change from 0 to 240 loop6: detected capacity change from 0 to 240 loop6: detected capacity change from 0 to 240 loop2: detected capacity change from 0 to 256 loop2: detected capacity change from 0 to 264192 nfs4: Unknown parameter '/±')\' loop2: detected capacity change from 0 to 256 loop2: detected capacity change from 0 to 264192 nfs4: Unknown parameter '/±')\' loop6: detected capacity change from 0 to 240 loop2: detected capacity change from 0 to 256 loop4: detected capacity change from 0 to 40 loop5: detected capacity change from 0 to 256 loop2: detected capacity change from 0 to 264192 nfs4: Unknown parameter '/±')\' loop5: detected capacity change from 0 to 264192 nfs4: Unknown parameter '/±')\' loop2: detected capacity change from 0 to 256 loop2: detected capacity change from 0 to 264192 nfs4: Unknown parameter '/±')\' loop5: detected capacity change from 0 to 256 loop5: detected capacity change from 0 to 264192 nfs4: Unknown parameter '/±')\' syz-executor.4: attempt to access beyond end of device loop4: rw=2049, sector=40, nr_sectors = 4 limit=40 Buffer I/O error on dev loop4, logical block 10, lost async page write syz-executor.4: attempt to access beyond end of device loop4: rw=2049, sector=40, nr_sectors = 4 limit=40 Buffer I/O error on dev loop4, logical block 10, lost async page write loop2: detected capacity change from 0 to 256 loop5: detected capacity change from 0 to 256 loop4: detected capacity change from 0 to 40 loop2: detected capacity change from 0 to 264192 loop5: detected capacity change from 0 to 264192 nfs4: Unknown parameter '/±')\' nfs4: Unknown parameter '/±')\' loop6: detected capacity change from 0 to 40